From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 41/41] KVM: SVM: enable LBRV virtualization if available Date: Sun, 1 Apr 2007 17:35:38 +0300 Message-ID: <11754381403398-git-send-email-avi@qumranet.com> References: <1175438138288-git-send-email-avi@qumranet.com> <11754381381990-git-send-email-avi@qumranet.com> <11754381384009-git-send-email-avi@qumranet.com> <1175438138805-git-send-email-avi@qumranet.com> <11754381382515-git-send-email-avi@qumranet.com> <11754381383730-git-send-email-avi@qumranet.com> <11754381383144-git-send-email-avi@qumranet.com> <11754381381597-git-send-email-avi@qumranet.com> <1175438139242-git-send-email-avi@qumranet.com> <1175438139494-git-send-email-avi@qumranet.com> <11754381392046-git-send-email-avi@qumranet.com> <1175438139795-git-send-email-avi@qumranet.com> <1175438139430-git-send-email-avi@qumranet.com> <11754381393496-git-send-email-avi@qumranet.com> <11754381391514-git-send-email-avi@qumranet.com> <11754381392382-git-send-email-avi@qumranet.com> <11754381392358-git-send-email-avi@qumranet.com> <1175438139872-git-send-email-avi@qumranet.com> <11754381392921-git-send-email-avi@qumranet.com> <117543813978-git-send-email-avi@qumranet.com> <117543 81393061-git-send-email-avi@qumranet.com> <11754381392186-git-send-email-avi@qumranet.com> <117543813916-git-send-email-avi@qumranet.com> <1175438139530-git-send-email-avi@qumranet.com> <1175438139960-git-send-email-avi@qumranet.com> <1175438139816-git-send-email-avi@qumranet.com> <1175438139141-git-send-email-avi@qumranet.com> <11754381391993-git-send-email-avi@qumranet.com> <1175438139877-git-send-email-avi@qumranet.com> <11754381391119-git-send-email-avi@qumranet.com> <1175438139312-git-send-email-avi@qumranet.com> <11754381392527-git-send-email-avi@qumranet.com> <11754381393184-git-send-email-avi@qumranet.com> <1175438139249-git-send-email-avi@qumranet.com> <11754381391161-git-send-email-avi@qumranet.com> <11754381393714-git-send-email-avi@qumranet.com> <11754381392948-git-send-email-avi@qumranet.com> <1175438139458-git-send-email-avi@qumranet.com> <117543813933-git-send-email-avi@qumranet.com> <11754381393962-git-send-email-avi@qumranet.com> <11754381393751-git-send-ema il-avi@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: In-Reply-To: <11754381393751-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org From: Joerg Roedel This patch enables the virtualization of the last branch record MSRs on SVM if this feature is available in hardware. It also introduces a small and simple check feature for specific SVM extensions. Signed-off-by: Joerg Roedel Signed-off-by: Avi Kivity --- drivers/kvm/svm.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 303e959..b7e1410 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -44,6 +44,10 @@ MODULE_LICENSE("GPL"); #define KVM_EFER_LMA (1 << 10) #define KVM_EFER_LME (1 << 8) +#define SVM_FEATURE_NPT (1 << 0) +#define SVM_FEATURE_LBRV (1 << 1) +#define SVM_DEATURE_SVML (1 << 2) + unsigned long iopm_base; unsigned long msrpm_base; @@ -68,6 +72,7 @@ struct svm_cpu_data { }; static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data); +static uint32_t svm_features; struct svm_init_data { int cpu; @@ -82,6 +87,11 @@ static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; #define MAX_INST_SIZE 15 +static inline u32 svm_has(u32 feat) +{ + return svm_features & feat; +} + static unsigned get_addr_size(struct kvm_vcpu *vcpu) { struct vmcb_save_area *sa = &vcpu->svm->vmcb->save; @@ -302,6 +312,7 @@ static void svm_hardware_enable(void *garbage) svm_data->asid_generation = 1; svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; svm_data->next_asid = svm_data->max_asid + 1; + svm_features = cpuid_edx(SVM_CPUID_FUNC); asm volatile ( "sgdt %0" : "=m"(gdt_descr) ); gdt = (struct desc_struct *)gdt_descr.address; @@ -511,6 +522,8 @@ static void init_vmcb(struct vmcb *vmcb) control->msrpm_base_pa = msrpm_base; control->tsc_offset = 0; control->int_ctl = V_INTR_MASKING_MASK; + if (svm_has(SVM_FEATURE_LBRV)) + control->lbr_ctl = 1ULL; init_seg(&save->es); init_seg(&save->ss); -- 1.5.0.5 ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV